Questions tagged [power-supply]

An electronic device which supplies electrical energy to a load. Can be AC or DC input. Typically DC output.

661 questions with no upvoted or accepted answers
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1answer
137 views

“Temporary boost” supercap

I have a 12VDC load (up to 10A) that functions correctly down to 8VDC. Sometimes (frequency: many seconds max, many minutes typical) the power source has a very brief (few milliseconds) drop to 7V. ...
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88 views

Radio module resetting when fluorescent tube switched on/off

I have a PCB powered by an IRM-30-12 power supply (230VAC to 12VDC). On this PCB, I have a MRF24J40MD from Microchip and a Udooneo to drive it + a 5VDC regulator and the 3.3VDC of the Udooneo. After ...
4
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1answer
355 views

Safety Capacitor Selection

When selecting an X2 safety capacitor what must be taken into consideration. There are only a few types of capacitance ranges and seem to be chosen based on voltage rather than capacitance. Take ...
3
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1answer
110 views

Switch between 2 power supply feeds without device losing power

I have done a search on here but didn't find the answer (maybe "woods for the trees") but here goes... A brief 'background' -- In my house, there's a switch by my front door that turns on/off the ...
3
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1answer
184 views

Powering 9216 leds @5V, @24V with converters

I am struggling with a power supply question. I would like to power up and control 9216 LEDs -- strips of 144 LEDs/meter (WWA SK6812 - just like the RGB kind). These are powered at 5V and draw 43.2 ...
3
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3answers
662 views

Efficient 60v to 12v DC-DC

I'm on the process of building a new version of my ebike electronic systems and I'm searching for a way to lower the voltage of the battery (13s = 54,6v fully charged) to 12v/5v for the accessories ...
3
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1answer
558 views

Proper way of designing a battery backup system with 12V/5V dual output AC power supply?

I have a project (doorlock) with MCU / LCD / Keypad and solenoid (lock) connected together. MCU, LCD and Keypad runs at 5V while solenoid runs at 9V to 12V. I'm currently powering the system with an ...
2
votes
1answer
37 views

Sensible way to power an OLED display from AAA Cells

I'm designing a small battery powered device and I want to use an SSD1327-based OLED display. Unlike the SSD1306, this one doesn't appear to have an integrated boost circuit to power the panel, which ...
2
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0answers
80 views

How to design analogue compensation for SMPS from Bode Plots?

In a complicated switched mode power supply where the transfer function is unknown, is there a way to design an analogue controller and compensation from the bode plot alone? I am having difficulty ...
2
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0answers
103 views

Help identifying component in SMPS

I have been working on a Schroff/Cherokee Europe PE1947/23B SMPS (circa 2004?) and have had trouble identifying a component within the circuit. This SMPS features the following outputs: +12v DC @ 8A ...
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0answers
143 views

How do airplane in-seat power detection circuits work?

Airplane in-seat AC line-voltage power outlets have limited available current/power. I remember reading that laptops or laptop power adapters can somehow detect this and inform the laptop that it ...
2
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2answers
105 views

Voltage doubler and power

Lets consider for instance this voltage doubler: It was told that a practical limit of this circuit is the fact that we cannot absorb too much current from it. But I wanted to verify (if it is true) ...
2
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0answers
50 views

Can a Capacitance Multiplier be used with high voltage outputs?

I am designing an SMPS which two output voltages of 5kV and 2.5kV. My transformer is split into four equal sections, each feeding a FB multiplier, connected in series to form the final voltages. ...
2
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0answers
60 views

How to remove DC power supply noise while load is active?

I'm using a breadboard power supply to power up two STM32F103, two Hall flow sensors, one IC555, and one 16x2 LCD with backlight. While everything is connected I have alot of noise in the system which ...
2
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0answers
101 views

Power Supply Nixie tubes (IN 9)

I am in big trouble with my power supply for Nixie tubes (IN 9 bargraph.) I need 140V -160V (150V prefered) output voltage and 10x 12mA --> ~140mA current. (~ 21W). I tried to design boost ...
2
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2answers
124 views

Can I use a current divider to protect my IC?

I designed an oscillator circuit using a TLC555 timer IC to create a 2 second pulse, which is used to drive a 12V 6W solenoid via a relay. Both the IC and the solenoid are run off of 12V, but every ...
2
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2answers
175 views

Battery failing. Oscilloscope?

The question is - is there an inexpensive oscilloscope I can use to measure DC voltage and current to see why my battery pack is failing to power a DSLR? In order to take long time lapse photos with ...
2
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0answers
51 views

Can I generate following voltage waveform with single PWM FET?

I am designing power supply which must output following voltages at a maximum of 1.5 A stepped down from a 24 V DC supply. 24 V 13-15 V 0-5 V Waveform for one of the inputs requires following ...
2
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1answer
117 views

Cuk converter implementation

I have come across this article: https://www.powerelectronics.com/power-management/step-down-dc-dc-converter-eliminates-ferrite-cores-50khz-enabling-power-supply-chip That describes the Cuk DC/DC ...
2
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0answers
721 views

ignition timing light trigger current

I've built an ignition timing light, following: http://citroen.tramontana.co.hu/en/ignition/stroboscopic-timing-light here the original schematic: I've changed some components: Instead of the ...
2
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2answers
113 views

Any downside to feeding a buck regulator into a linear one?

I need to convert 12 V down to 5 V and 3.3 V. I am using linear regulators right now but they get pretty warm and eventually I would like to supply more current for it (around 500-700&...
2
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0answers
125 views

55-650V to 5V DC/DC convertor design

For an application I am building I need a custom DC/DC convertor that can convert a voltage ranging from 60V-600V to a contant voltage of around 5V. Using the TI Webench with the paramaters Vin_min = ...
2
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0answers
186 views

Low power circuit design

I want to design a low power circuit with stm32l micro and LoRa Module as its radio to send a sensor data to a gateway. The circuit is powered with a non rechargeable battery. My problem is about its ...
2
votes
1answer
311 views

Can I use a twisted pair cable to send power to a device that uses a micro-USB jack?

I purchased a Google Home Mini that according to the specs this requires 5V, 1.8A. The OEM power cable has a transformer that plugs into AC and has about 3 feet of cable terminating at a USB micro ...
2
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0answers
62 views

Connecting the output of two motor controllers together - even if briefly

I am building a dark ride at my house for a party (long story), where the I have a ride vehicle that is a wooden base with 4 casters and 2 powerchair motors hugging a center 2x6 rail on a plywood base ...
2
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0answers
137 views

Badly designed USB power supply?

Purchased a device from an online retailer (fairly well known and reputable), they ship from internationally and often include a local USB wall charger to replace the one in the box of their goods. ...
2
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0answers
516 views

Advanced ATX Power Supply Modifications

I know there are multiple tutorials and questions regarding converting an ATX power supply, new or old, to a benchtop power supply for projects. I'm fully aware of how to make the basic conversion to ...
2
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0answers
685 views

Deriving PI controller transfer function when input is reversed

I'm developing the compensator for the linear DC Bench Power Supply I'm designing. As I've come to deriving the transfer function for the op amp-based compensator, I realize I've been depending on a ...
2
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0answers
129 views

High Frequency Ferrites for Transformers

There are many Ferrite material grades Available.The optimum frequencies start around 20KHz and extend well into the MHz range.There are also many core sizes to go from watts to Kw .Planar cores are ...
2
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1answer
151 views

Designing an efficient PSU

I am designing a PSU capable of producing 5 watts @ 5V 1A. The design will power about 12 RGB LEDs (totaling about 400mA @ 5V) and a audio class D 1.4 W amp. Space is no issue but efficiency and cost ...
2
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1answer
663 views

Power Supply Stacking in Parallel

I have two DLM 60-10 Sorenson bench power suppllies (10A limit) that I am wanting to stack in parallel so that I can provide between 1 and 20 A, at a consistent 12 V. I'm not particularly an ...
2
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1answer
1k views

Designing a DC 12V 80A Power Distribution PCB panel and heat sinking

Background I'm trying to build a small hobby grade ROV for an underwater robotics competition held at the university I'm studying. And I have used eight brushed dc motors each of which consumes 8A on ...
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0answers
19 views

How to regulate a resonant converter at no load?

I am designign a high voltage power supply using the half bridge LCC topology (NOT LLC), but I suppose it relates to both. When operating at full load, the high voltage output settles at the desired ...
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0answers
20 views

TP4056 and ST32F103C8T6 shorting after few uses

Complete schematic: Top part: Lower part: This is the circuit schematic, top part is sensor, bluetooth, microcontroller, oled and pins related all working from 3.3v coming from regulation of a ...
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35 views

Powering Negative Vcc on Op Amp with no negative supply voltage

I am making a shunt current sense resistor circuit. I will place this circuit on my main PCB board to measure the current going through all the different channels. I have a supply voltage of 12V Vcc ...
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0answers
35 views

Zynq-7000 SoC Power-on current limit

I'm designing the power supply line and voltage regulator for a Xilinx Zynq 7000 SoC and I'm not sure how to consider the specification from datasheet concerning the minimum and maximum current to be ...
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0answers
46 views

Modest DC arc welder with Bipolar transistors

I am building a modest 50V/50A welder-variable switchmode power supply. luckily I have some parts in my junk and salvaged parts, unluckily not all! I intend to build this welder around a TL494, toroid ...
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0answers
59 views

Unstable current source when reaching a certain threshold in current draw

I’m currently building a system for automated testing of ECUs. It consists of an ECU with regulated loads connected to its power outputs. The other IO of the ECU is connected to an IO expansion card. ...
1
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1answer
18 views

Current waveform for LTE transmit

I am designing an IoT system which uses the SIM7000A. In the SIM7000 series datasheet it says that the highest possible current for LTE is under 200mA (section 5.4 of SIM7000 Hardware Design_V1.03). ...
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0answers
61 views

Inductance of a single conductor

Which is the correct expression for the inductance of a single conductor? I see 2 different formulaes for the same in different sources. Formula 1. Ref: https://www.eeweb.com/tools/wire-inductance ...
1
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1answer
58 views

AC to DC 12V 2A USB adapter

I have an external hard drive that I travel with to back up photos. It has a large (and quite heavy) AC/DC adapter that outputs 12V and 2A DC. I'd like to be able to leave that home and carry a small ...
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0answers
36 views

Multiple switching power supplies sharing the same(v-) reference

I need multiple 5v switching power supplies to power around 12,000 WS2812 digital Leds. I also need a MCU, which will be powered by a 12v supply through a DC bulk converter. The goal is to have ...
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1answer
58 views

Suitable substitute for a hard to get IRF440 in a switched power supply?

I am repairing a HP 6023A lab power supply for a friend. The problem was that the power fets had failed. This is what the relevant schematic looks like: The incoming 120VAC or 240VAC is rectified and ...
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2answers
189 views

Feeding microcontroller and linear actuators (motors) with the same power supply

I have already made a diagram using a motor controller. The details of the actuators are: Input voltage: 12VDC Max Load: 750N(168.607lbs) Stroke Length: 16 inch Travel Speed: 12mm/s Duty Cyle: 25%. ...
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1answer
113 views

Mechanical Switch Causes Transients from AC-DC Power Supply

I'm having trouble getting rid of output transients from this Mean Well PSU right after the AC input is switched. https://www.meanwell.com/Upload/PDF/RPS-500/RPS-500-SPEC.PDF The PSU is a RPS-500 ...
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0answers
30 views

How do I measure the fluctuation of a pulsed voltage of ~1700V?

The problem: See the little sketch. Starting from a high-precision DC power supply, I pass the voltage to low-pass filter and a pulser. This pulser pulses the nominal voltage of around ~1700V down to ...
1
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1answer
51 views

How to interpret a negative primary leakage inductance in a three winding transformer?

i would like to compare the leakage inductance on the primary side of different transformer geometries. I simulated a three winding transformer with an UI Core. On one leg i have the splitted primary ...
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0answers
37 views

LTC3112 undefined behaviour when power supply reaches current limit

I am getting a behaviour of LTC3112 that I do not understand. I am using it very close to the schematic recommendations in the datasheet. It works perfectly fine until my power supply (TOE 7610-60) ...
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0answers
22 views

Fixed Frequency Control of Multi-Resonant Converters

I am currently designing a SMPS based on the half-bridge LCC converter. Due to my application, it is desired to operate the converter at a fixed frequency. I also wish to optimize the passive ...
1
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1answer
47 views

By pass diode in PV cells

hope you all are well The bypass diode is usually connected in parallel with PV cell to avoid hot spot and prevent more PV output power losses. The bypass diode is connected in opposite direction to ...